ajaxStart和ajaxStop

当有ajax请求时，当加载信息较慢时，会显示该等待图片，带来良好的用户体验
$("#wait").ajaxStart(function() {
$(this).show();
});

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<wbr>$("#wait").ajaxStop(function() {<br><wbr>$(this).hide();<br><wbr>});</wbr></wbr></wbr>

<span id="wait" style="visibility:hidden"><img src="images/wait.gif" alt="等待" />

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也可以对全局

<wbr>$(document).ajaxStart(function () { });</wbr>

$(document).ajaxStop(function () { });